Steam generator



Sept. 6,1932.

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W. H. HARDIE STEAM GENERATOR 2 Sheets-Sheet 2 Filed Feb. 26, 1931 INVENT R @am 47# BY 14; ATTORNEY Patented Sept. 6, 1932 Unirse STATES PA'llfm"v OFFFCE A' n WILLIAM HUGER HARDIE, OE NEW YORK, N.,Y.,AssIGNoR To FOSTER WHEELER. con;Y

' roRATrON, or NEW YORK, N. Y., A CORPORATION OE NEW YORK STEAM GENERATOR y.Application vfiled Eebruary, 1931. Serial 110,518,361.

VMy invention relates to steam generators and more particularly my invention consists ina novel and improved superheater in conjunction vwith 'a steam boiler.

i Among the objects of my invention are:

To provide an improved superheater utilizing both convection and radiant heat, to provide a superheater Whichhas a'large heat transfer surface, to provide a superheater which not subject to bending stresses and which isvfree to expand and contract, to provide asuperheater in which the tendencyy of the superheater tubes to bend and sag is minimized, and toy provide a superheater which is `supported in an improved manner. A

While I have devised this superheater for use in connection with a specific Atype of boiler, and it has certain specific relationships with and advantages in connection with such type of boiler, it will be understood that the invention may be applied to superheaters used-in combination with boilers of other types than that Yhereinafter disclosed.

My improved superheater and its relation to the boiler are described inthe `following specification, which is to be considered in connection with the accompanying drawings, of which: l Y v Fig. 1 is a sectional elevational view of a steam generator embodying the invention, which view is taken onthe line 1 1 of Figs. 2 and 3; y

Fig. 2 is a sectional view taken on the line 2 2 of Fig. 1; Y

Fig. 3 is a sectional view taken on thevv line 3 3 of Fig. 1; and 1 n Fig. 4 is a sectional view taken on the line 4 4 of Fig. 1 l

l.The steam generator includes front and rear walls 10 and 11. respectively, sidewalls 12,Aand a roof structure 13 enclosing` a furnace chamber 14 and a boiler space 15. Suitable means are provided .as at 16 to cause combustion to take place in the furnace chamber 14. `The boilerspacel is that portion ofthe tot-al space enclosed by theV walls which contains the boiler. The boiler is'designated generally by reference character 17. The particular boiler illustrated includes a lower horizontal 18 and three 'upper steam and water drums 1,9, 20, and 21.

yThree groups kor banks `of vertically inclined tubes are connected to drum 18. The f A forward or radiant bank'22 is adjacent the furnace or combustion chamber and is positioned to receive radiant heat.

This bank is connected to drum19. Asecond bank of tubes 23, which is a' convection bank, is also yconnected between' drum v18V anddrum 19.

Between these banks is a space'24, which may be termed a superheater space. A bank ofy tubes 25 connects drum 18 with drum 21. This is a rear bank of'tubes with respect to the furnace chamber. Steam connections'26 connect drums 19 and 20. Steam connections 27 connect drums -20 and 21. vWater connections 28 connect drums 20 and 21.

A baffle 29 extends from the drum 18 along the back ofthe bank of tubes 22 for some distance, thence transversely to the forward side of bank 23 and upwardly along the forward side of bank 23, leaving apassage for products of combustion between the` upper end'of this baffle and the drum 19. A`

battle 3() extends downwardly from drum 20 and along the rear side of bank 23, thence transversely to thev forward side of bank 25 land upwardly along the forward side of bank 4 25 to the drum 21. A passage Vis formed for products of combustion between the lower end of this balfle and drum 18. A baille 31 extends upwardly from the V,rear wall 11 along the rear side of bank' 25 and laterally to the outlet flue 32. A passage 33 is provided at the rear of the top of the bank 25.' An economizer 34 is situated in the flue 32. The path of the products of combustion,A is generally upward along bank 22, downward along bank 23, upward along bank 25, and

.downward through flue 32.

Within drum 18 are plates 35 forming a chamber 36.A The rearmost tubes of bank 25 are connected to this chamber andto a header 37, constituting a feed water inlet header. Two other rows of tubes are connected to chamber 36. Feed water passes from header 37 downwardly through the rearmost tubes of bank 25 and thence upwardly through the next two rows andy into drum 21. Water is 100 present in drum 18 and all the tubes of the various banks, and in the three drums 19, 20, and 21 to a height substantially as shown in Fig. l. Steam is withdrawn from the upper part of drum 2O through conduit 38.

Conduit 38 is connected to upper superheater header 40. This header is arranged horizontally and between drums 19 and 20. A lower superheater header 41 is supported in the baille 29. Between these two headers extend the superheater tubes 42.

Beginning at the upper superheater header` 40, it will be seen that the superheater tubes' extend downwardly andv forwardly in the lanes of the water tube bank 23, thence forwardly into lanes between tubes of the forward bank of water tubes 22, thence rearwardly into the superheater space 24, thence forwardly into the lanes between the tubes of bank 22 and again rearwardly to connect with the lower superheater header 4l. The tubes are supported at 43 by the baffle 29. lt will be seen that the forward bends 44 and 46 of the superheatertubes extend toward the furnace chamber so as to be exposed to radiant heat from the fire in the combustion chamber. The more rearward portions of the superheater tubes are heated by convection heat. The configuration of the tubes provides a large tube surface for a given distance between headers. The intermediate support of the tubes maintains them in position and prevents sagging. It will be seen that the configuration of the tubes permits freedom of expansion and contraction.

Header 40 is divided by means of a partition 47. As shown in Fig. 3, the steam to be superheated passes into the left-hand side of header 40, thence through the left-hand superheater tubes, thence through the header 4l, upwardly through the right-hand superheater tubes and out through the right-hand connection, all as shown in Fig'. 3.

It will be understood that variations may be made within the scope of the invention.

What I claim is:

1. A steam generator comprising walls enclosing a furnace chamber and a boiler space, a boiler in the boiler space comprising an upper drum, a lower drum, a bank of vertically inclined tubes connecting the lower and upper drums and arranged to receive radiant heat, and a superheater comprising headers behind the bank and tubes connecting the headers, an intermediate support for the tubes behind the bank and said tubes having bends between the support and the headers extending forwardly toward the furnace chamber in lanes in said bank.

2. A steam generator comprising walls enclosing a furnace chamber and a boiler space, a boiler in the boiler space comprising' an upper drum, a lower drum, a forward bank of vertically inclined tubes connecting the lower and upper drums and arranged to receive radiant heat, a convection bank of vertically inclined tubes connecting the lower and upper drums, a baffle between said banks and a superheater comprising headers behind the forward bank and tubes connecting the headers having intermediate porti-ons thereof supported on said bafflev and having bends extending forwardly toward the furnace chamber in lanes in said'forward bank.

3. A steam generator comprising walls enclosing a furnace chamber and a boiler space, a boiler in the boiler space comprising an upper drum, a lower drum, a forward bank of vertically inclined tubes connecting' the lower and upper drums and arranged to receive radiant heat, a convection bank'of vertically inclined tubes Vconnecting the lower and upper drums, a baffle between said banks and a superheater comprising anv upper header and a lower header behind the forward bank and tubes connecting the headers hav ing intermediate portions thereof supported on said baffle and having bends extendingforwardly toward the furnace chamber in lanes in said forward bank, said baflie having Va portion thereof adjacent the rear side of the forward bank and a portion thereof. adjacent the forward side of the convection bank and a transverse portion connecting the aforesaid portions, said lower header being inserted in said transverse portion.

4. A steam generato-r comprising walls enclosing a furnace chamber and a boiler space, a boiler in the boiler space comprising an upper drum, a lower drum, a forward bank of vertically inclined tubes connecting the lower and upper drums and arranged to receive radiant heat, a convection bank of vertically inclined tubes connecting the lower and upper drums, a baffle between said banks and a superheater comprising headers behind the forward bank and zigzag tubes connecting the headers having intermediate portions thereof supported on said baflle.

5. A steam generator comprising walls enclosing a furnace chamber and a boiler space, a boiler in the boiler space comprising an upper drum, a lower drum, a forward bank of vertically inclined tubes connecting the lower yand upper drums and arranged to receive radiant heat, a convection bank of vertically inclined tubes connecting the lower and upper drums, a baffle between said banks and a superheater comprising headers behind the forward bank and tubes connecting the headers having intermediate portions thereof supported adjacent said baffle and having ends extending forwardly toward the furnace chamber in lanes in said forward bank.

6. A steamvgenerator comprising walls enclosing a furnace chamber and a boiler space, a boiler in the boiler space comprising an upper drum, a lower drum, a forward bank of vertically inclined tubes connecting the lower and upper drums and arranged to receive radiant heat, a convection bank of vertically inclined tubes connecting the lower and upper drums, a baffle between said banks and a superheater comprising an upper header and a lower header behind the forward bank and tubes connecting the headers having intermediate portions thereof supported adjacent said baiiie and having bends extending forwardly toward the furnace chamber in lanes in said forward bank, said baffle having a portion thereof adjacent the rear side of the forward bank and a portion thereof adjacent the forward side of the convection bank and a transverse portion connecting the c aforesaid portions, said lower header being inserted in said transverse portion.

7. A steam generator comprising walls enclosing a furnace chamber and a boiler space, a boiler in the boiler space comprising an upper drum, a lower drum, a forward bank of vertically inclined tubes connecting the lower and upper drums ,andv arranged to receive radiant heat, a convection bank of vertically inclined tubes connecting the lower and upper drums, a baiile between said banks and Va superheater comprising headers behind the forward bank and zigzag tubes connecting the headers having intermediate portions thereof supported adjacent said baille.

In testimony whereof I have aiixed my signature.

WILLIAM HUGER HARDIE. 

